CN109321786A - A kind of cobalt base superalloy and preparation method thereof - Google Patents
A kind of cobalt base superalloy and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
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- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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Abstract
The invention belongs to high temperature alloy fields, specially a kind of structure stability is high, the good γ ' phase of antioxygenic property strengthens cobalt base superalloy, its chemical composition comprises the following components in percentage by weight includes Al:2.5~4%, W:3~10%, Ti:0.5~5%, Ta:1.5~6%, Ni:18~35%, Cr:10~14%, Nb:0~4.5%, Hf:0~0.5%, C:0~0.1%, B:0~0.1%, Zr:0~0.1%, Si:0~0.5%, surplus Co, and Al+Cr >=13.5%, Al+Ti+Ta+Nb >=9.5%, W+Ta≤12.5%.The present invention uses vacuum arc furnace melting, solid solution is then carried out at 1200~1250 DEG C and in 700~900 DEG C of progress aging strengthening models.γ/γ ' two-phase structure of alloy of the present invention is stabilized at 700~900 DEG C, and γ ' strengthens phase volume fraction and is greater than 40%, simultaneously, the alloy has good antioxygenic property, big hot processing window and low alloy density are the candidate materials of aero-engine and industry gas turbine high temperature diskware.
Description
Technical field
The invention belongs to technical field of high temperature alloy, it is related to that a kind of structure stability is high, the good γ ' phase of antioxygenic property
Strengthen cobalt base superalloy and preparation method thereof.
Background technique
High temperature alloy has high elevated temperature strength, excellent creep and fatigue resistance, good high oxidation and corrosion resistance, group
Stability and use reliability are knitted, therefore the pass that the hot-end component as aero-engine and industrial gas turbine is irreplaceable
Key material.Last century the '30s to the fifties there is solution strengthening and carbide reinforced cobalt base superalloy to be opened
Hair, and take the lead in being applied on aero-engine hot-end component.Compared to nickel base superalloy, cobalt base superalloy has more
High fusing point, better corrosion and heat resistant, thermal fatigue resistance and welding performance.However, because lacking L1 in traditional cobalt base superalloy2
Type γ ' phase strengthening mechanism, elevated temperature strength and temperature capability are substantially less than the nickel base superalloy strengthened by γ ' phase, and gradually by
The latter replaces.
Until 2006, Sato et al. had found similar with nickel base superalloy in Co-Al-W ternary alloy system
γ/γ ' two-phase microscopic structure, solution temperature reach 990 DEG C, imply that its elevated temperature strength and temperature capability will significantly improve,
This is that traditional cobalt base superalloy does not have [Sato J, Omori T, Oikawa K, et al.Cobalt-base high-
temperature alloys[J].Science,2006,312(5770):90-91.].Then, other scholars research shows that:
The Quito Co-Al-W crystalline substance and single crystal alloy 850 DEG C and 900 DEG C croop property respectively with Ni-based polycrystalline alloy IN100 and first
It is suitable for nickel-base high-temperature single crystal alloy Ren é N4, show good mechanical behavior under high temperature.And Co-Al-W based alloy is being protected
While holding higher γ ' phase volume fraction, it is lower than nickel base superalloy that γ ' phase is completely dissolved temperature, so that such alloy has
There is bigger hot processing window.Therefore, the novel cobalt base superalloy that this γ ' phase is strengthened can have good mechanics simultaneously
Performance and environment drag, and there is better hot-working character, wrought superalloy may be more suitable for and applied in aviation hair
On the high temperature diskware of motivation and gas turbine.
Up to now, existing novel cobalt base superalloy is mainly based on the simple ingredient of low pivot (3~5 yuan), only
There are German S.Neumeier seminar, D.Dye seminar of Britain, Carpenter Technology company of the U.S. and China to pay
Hua Dong seminar reports multicomponent cobalt-based wrought superalloy ingredient.Wherein the cobalt-based of S.Neumeier seminar becomes
The composition characteristic of shape high temperature alloy is that Ni, W, Ta content are higher, since W, Ta content are higher, total content 13.4~15.5%,
Lead to higher (the > 8.8g cm of its density-3), in order to obtain big hot processing window, γ ' hardening constituent formation element such as Al, Ti,
The content of Ta is less, and total content is 4.8~9.1%, this makes its elevated temperature strength, and there are also the space [Neumeier further promoted
S,Freund L P,M.Novel wroughtγ/γ′cobalt base superalloys with high
strength and improved oxidation resistance[J].Scripta Materialia,2015,109:
104-107.].The composition characteristic of the cobalt-based wrought superalloy of D.Dye seminar of Britain is high Ni, Al, Cr content, wherein
Ni content is suitable with Co content, and Al, Cr total amount are more than 17.7%, has good antioxygenic property at 800 DEG C, but in alloy not
Add Ti element, the total content of γ ' hardening constituent formation element such as Al, Ta are lower, be 7.8% [Knop M, Mulvey P,
Ismail F,et al.A new polycrystalline Co-Ni superalloy[J].JOM,2014,66(12):
2495-2501.].The composition characteristic of the cobalt-based wrought superalloy of Carpenter Technology company of the U.S. be high Ni,
Al, Ti, low Cr, anti-oxidizing elements Al, Cr total amount reach 13.5%, but do not add Ta element in alloy, and γ ' hardening constituent is formed
The total content of element such as Al, Ti are lower, close to 7.0% [Forsik S A J, Rosas A O P, Wang T, et al.High-
Temperature Oxidation Behavior of a Novel Co-Base Superalloy[J].Metallurgical
and Materials Transactions A,2018,49(9):4058-4069.].The cobalt-based of Chinese Fu Huadong seminar becomes
The composition characteristic of shape alloy is the effect for highlighting Alloy Elements Mo, replaces part W element with Mo, for reducing alloy density,
It is well known that Mo unfavorable to the high-temperature oxidation resistance of alloy [pair Hua Dong, Xie Jianxin, Zhang Yi, a kind of low-density, high tissue
Cobalt base superalloy of stability and preparation method thereof].
Although in conclusion current it has been reported that part multicomponent cobalt-based wrought superalloy ingredient, these alloys
Ingredient is more to pursue a certain single performance, cause these alloys comprehensive performance be not it is best, using being restricted.Cause
This, improves multicomponent cobalt-based wrought superalloy comprehensive performance, especially under the premise of keeping structure stability, while improving anti-
Oxidation susceptibility, elevated temperature strength, reduction density are the key that realize the engineering application of such alloy.Guaranteeing microstructure stability
Under the premise of, by increasing Al, Cr content, increases Al, Ti, Ta, Nb γ ' hardening constituent formation element content, it is highly dense to reduce W, Ta
Degree constituent content is to improve antioxygenic property simultaneously, elevated temperature strength, reduce density most efficient method.
Summary of the invention
It is high that the purpose of the present invention is to provide a kind of γ/γ ' two-phase structure stability, and antioxygenic property is good, and high temperature is strong
Degree is high, and hot-working character is good and density is low, and the good γ ' phase of comprehensive performance strengthens cobalt base superalloy and preparation method thereof.
After melt back, solid solution and aging strengthening model, make obtained novel cobalt base superalloy can be within 700~900 DEG C
Form stable γ/γ ' two-phase structure, γ ' phase is in cube or spherical morphology and volume fraction are greater than 40%, and antioxygenic property is bright
It is aobvious to be better than low pivot Co-Al-W based alloy (Co-8Al-8W-4.5Cr-1.5Ta) and Ni-based commercial high temperature alloy
(Waspaloy, Udimet 720Li), hot processing window are significantly higher than the Ni-based commercial high temperature under the conditions of same γ ' phase volume fraction
Alloy, density other cobalt base superalloys existing lower than major part, and it is suitable with advanced ni-base wrought superalloy.
The present invention is achieved through the following technical solutions:
A kind of structure stability is high, the good γ ' phase of antioxygenic property strengthens cobalt base superalloy, alloy composition
It is by weight percentage Al:2.5~4%, W:3~10%, Ti:0.5~5%, Ta:1.5~6%, Ni:18~35%, Cr:10
~14%, Nb:0~4.5%, Hf:0~0.5%, C:0~0.1%, B:0~0.1%, Zr:0~0.1%, Si:0~0.5%,
Surplus Co, and Al+Cr >=13.5%, Al+Ti+Ta+Nb >=9.5%, W+Ta≤12.5%.
The alloy is γ/γ ' two-phase structure, respectively the γ matrix of A1 crystal structure after solid solution and aging strengthening model
Phase and L12The γ ' precipitated phase of crystal structure, wherein γ ' hardening constituent is cube or spherical morphology and volume fraction are greater than 40%.
Above-mentioned alloy preparation technology comprises the steps of:
(1) pure metals such as Co, Al, W, Ti, Ta, Ni, Cr, Nb, Hf, C, B, Zr, Si are weighed by composition proportion；
(2) the above-mentioned simple substance raw material weighed are placed in vacuum arc melting furnace crucible, it is evacuated down to 3 for the first time ×
10-3Pa~5 × 10-3After Pa, high-purity Ar protective gas is filled with to 6 × 104Pa~8 × 104Then Pa is evacuated down to 3 for the second time
×10-3Pa~5 × 10-3Pa is re-filled with high-purity Ar protective gas to 6 × 104Pa~8 × 104Pa；
(3) alloy melting is carried out in high-purity Ar protective atmosphere, the size of current of melting electric arc is controlled in 230~260A,
It is kept for 30~60 seconds after alloy is completely melt, then power-off is cooled to alloy and solidifies completely, it repeats the melting step 6~8 times,
Finally obtain cobalt base superalloy ingot；
(4) in high-purity Ar protective atmosphere, the cobalt base superalloy ingot of above-mentioned preparation is consolidated at 1200~1250 DEG C
12-24 hours are kept the temperature under solubility temperature, it is air-cooled；Then 50-300 hours are kept the temperature in the range of aging temp is 700~900 DEG C,
Quenching is cooling to strengthen cobalt base superalloy to get to γ ' phase.
Further preferred scheme, cobalt base superalloy ingot is protected under 1200~1250 DEG C of solid solubility temperature in step (4)
Temperature 24 hours keeps the temperature 50 hours in the range of aging temp is 700~900 DEG C.
Alloy of the present invention is being designed to that timesharing comprehensively considered structure stability, inoxidizability of the alloying element to alloy
The influence of energy, mechanical behavior under high temperature, hot-working character and density, specific Consideration are as follows:
Al: γ ' phase formation element, improve γ ' phase be completely dissolved temperature and stability, and under high temperature alloy surface can
Form protective Al2O3Protective film, to playing a key effect in anti-oxidant and corrosion and heat resistant, while density is low, advantageously reduces
Alloy density.But Al content is excessively high, and alloy is readily able to that β phase is precipitated, and is unfavorable for tissue stabilization, and therefore, Al content is 2.5~4%.
W: γ ' phase formation element improves γ ' phase and is completely dissolved temperature and stability, and solid solution strengthening effect is obvious, control
The roughening rate of γ ' phase.But the density of W is very high, and excessive addition will lead to alloy density and significantly increase, therefore, W content 3
~10%.
Ti: γ ' phase formation element, hence it is evident that improve γ ' phase and be completely dissolved temperature and volume fraction, improve γ ' phase antiphase domain
Boundary's energy, enhances alloy high-temp mechanical property, and density is lower, advantageously reduces alloy density.But Ti is significantly reduced solid simultaneously
Liquidus temperature, reduces hot processing window, and to be roughened rate very fast for the γ ' phase of high Ti alloy, is unfavorable for structure stability, in addition,
Ti is unfavorable for the high-temperature oxidation resistance of alloy, and therefore, Ti content is 0.5~5%.
Ta: γ ' phase formation element, hence it is evident that improve γ ' phase and be completely dissolved temperature, volume fraction and stability, enhance alloy
Mechanical behavior under high temperature.But Ta is significantly reduced solidus temperature simultaneously, reduces hot processing window, and the density of Ta is very high, excessively
Addition will lead to alloy density and significantly increase, therefore, Ta content is 1.5~6%.
Ni: γ ' phase formation element, hence it is evident that expand γ/γ ' two-phase section, improve microstructure stability, and in certain journey
γ ' phase is improved on degree is completely dissolved temperature.But the chemical composition of Ni too high levels, γ ' phase will be closer to Ni3Al, roughening speed
Rate will increase, and therefore, Ni content is 18~35%.
Cr: γ phase formation element is capable of forming protective Cr in alloy surface under high temperature with solid solution strengthening effect2O3
Protective film, and Al can be promoted2O3The formation of protective film, to playing a key effect in anti-oxidant and corrosion and heat resistant.But Cr content mistake
Easy precipitation σ phase is unfavorable for tissue stabilization by height, and therefore, Cr content is 10~14%.
Nb: γ ' phase formation element, hence it is evident that improve γ ' phase and be completely dissolved temperature and volume fraction, improve γ ' phase antiphase domain
Boundary's energy, enhances alloy high-temp mechanical property.But Nb is significantly reduced solidus temperature simultaneously, reduces hot processing window, excessive
Nb will make alloy be easy that TCP phase is precipitated, and be unfavorable for tissue stabilization, and therefore, Nb content is 0~4.5%.
Hf: γ ' phase formation element, easily formation carbide, play a significant role purification crystal boundary.But Hf too high levels, will
It is easy that TCP phase is precipitated, is unfavorable for tissue stabilization, therefore, Hf content is 0~0.5%.
C: boundary-strengthening element is conducive to deoxidation during alloy melting, improves the degree of purity of alloy, and transgranular or
Carbide is formed on crystal boundary, is enhanced alloy mechanical property, and fixed part refractory element, is reduced matrix degree of supersaturation, play suppression
The effect that TCP phase processed is precipitated, is conducive to tissue stabilization.But C content is excessively high, and continuous, net distribution carbon will be formed on crystal boundary
Compound will be unfavorable for alloy mechanical property, and therefore, C content is 0~0.1%.
B: boundary-strengthening element increases alloy plasticity, is conducive to the compatible deformation of crystal boundary in hot procedure, and can mention
The antioxygenic property and creep-resistant property of high alloy.But B content is excessively high, is readily able to form boride in crystal boundary, is unfavorable for alloy
Mechanical property, therefore, B content are 0~0.1%.
Zr: boundary-strengthening element plays a significant role purification crystal boundary, and improves alloy plasticity and creep-resistant property.But
Zr too high levels will be unfavorable for alloy mechanical property, and therefore, Zr content is 0~0.1%.
Si: be conducive to alloy antioxygenic property.But Si too high levels will be unfavorable for microstructure stability and mechanical property
Can, therefore, Si content is 0~0.5%.
The content of Al+Cr:Al and Cr directly affects the antioxygenic property of alloy, to guarantee alloy in 700~900 DEG C of antioxygens
Change performance, therefore, Al+Cr >=13.5%.
Al+Ti+Ta+Nb:Al, Ti, Ta, Nb are γ ' phase formation elements, and content directly affects the volume point of γ ' phase
It counts and is completely dissolved temperature, the mechanical behavior under high temperature of alloy is determined, for the elevated temperature strength for further increasing alloy, therefore, Al+
Ti+Ta+Nb >=9.5%.
The density of W+Ta:W and Ta is very big, and content directly determines alloy density, to control alloy density, makes it have work
Journey application value, therefore, W+Ta≤12.5%.
The beneficial effects of the present invention are: the good γ ' phase of this kind of structure stability height, antioxygenic property strengthens cobalt-based high-temperature
The cobalt base superalloy of alloy and preparation method thereof preparation possesses uniform γ/γ ' two-phase structure, in 700~900 DEG C of stabilizations
In the presence of, and γ ' phase volume fraction is greater than 40%, no TCP harmful phase is precipitated, and the variation of γ ' phase size is little after long-time aging,
This means that the cobalt base superalloy has high mechanical behavior under high temperature, and it is unobvious to fail as time increases.Meanwhile the conjunction
900 DEG C of 100h oxidation weight gains of gold are lower than 0.4mg/cm2, hence it is evident that it is better than low pivot Co-Al-W based alloy (Co-8Al-8W-4.5Cr-
1.5Ta) and Ni-based commercial high temperature alloy (Waspaloy, Udimet 720Li), this shows that the cobalt base superalloy will possess
Better oxidation resistance.In addition, the hot processing window of the alloy is between 170 DEG C~270 DEG C, with reported novel cobalt-based
Wrought superalloy is suitable, and is significantly higher than the ni-base wrought superalloy under the conditions of androgynous fraction, such as Udimet 720Li
The hot processing window of alloy is only 50 DEG C or so, this represents the alloy with good hot-working character, is become suitable for heat
Shape processing, is such as forged.Finally, the density of the alloy is 8.39~8.76g cm-3, lower than most of other existing cobalt-based high-temperatures
Alloy, and it is suitable with advanced ni-base wrought superalloy, illustrate to can be used as aero-engine and the high Winchester disk of industry gas turbine
The candidate material of part, has a good application prospect.
Detailed description of the invention
Fig. 1 is that the scanning electron microscope of typical organization's pattern after alloy of the present invention (alloy 1) is heat-treated 50 hours at 750 DEG C is shone
Piece.
Fig. 2 is that the scanning electron microscope of typical organization's pattern after alloy of the present invention (alloy 1) is heat-treated 300 hours at 750 DEG C is shone
Piece.
Fig. 3 is alloy of the present invention (alloy 1~2) and Waspaloy, Udimet 720Li nickel-base alloy are aoxidized at 900 DEG C
100 hours oxidation weight gain curves.
Fig. 4 is alloy of the present invention (alloy 1~4) and Waspaloy, at 750 DEG C of Udimet 720Li nickel-base alloy
γ ' phase volume fraction and hot processing window relational graph.
Specific embodiment
Below in conjunction with the embodiment of the present invention, embodiments of the present invention are described in detail, so as to those skilled in the art
More fully understand advantages and features of the invention.Table 1 show the alloying component of embodiment and part refers to alloying component (weight
Measure percentage).Obviously, embodiments described below is only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art institute obtained without making creative work
There are other embodiments, shall fall within the protection scope of the present invention.
Table 1
Embodiment 1
The pure metals such as Co, Al, W, Ti, Ta, Ni, Cr are weighed by composition proportion shown in alloy 1~2 in table 1；By above-mentioned scale
The simple substance raw material taken are placed in vacuum arc melting furnace crucible, are evacuated down to 3 × 10 for the first time-3After Pa, it is filled with high-purity Ar
Protective gas is to 7 × 104Then Pa is evacuated down to 3 × 10 for the second time-3Pa is re-filled with high-purity Ar protective gas to 7 × 104Pa；
Alloy melting is carried out in high-purity Ar protective atmosphere, the size of current of melting electric arc is controlled in 250A, after alloy is completely melt
It is kept for 60 seconds, then power-off is cooled to alloy and solidifies completely, repeats the melting step 8 times, finally obtains cobalt base superalloy ingot
Material；In high-purity Ar protective atmosphere, the cobalt base superalloy ingot of above-mentioned preparation is kept the temperature 24 under 1250 DEG C of solid solubility temperature
Hour, it is air-cooled；Then 50 hours are kept the temperature under 750 DEG C of aging temp, quenching is cooling to strengthen cobalt-based high-temperature to get to γ ' phase
Alloy.
Fig. 1 show alloy 1 and keeps the temperature 50 hours under 750 DEG C of aging temp, typical organization's pattern after quenching is cooling
Stereoscan photograph, γ ' phase fine uniform are distributed in γ matrix, and pattern is in nearly rectangular, average-size 67nm, volume point
Number about 43% shows that it can be in 750 DEG C of is formationed γ/γ ' two-phase structures and γ ' phase volume fraction is greater than 40%.
Embodiment 2
The pure metals such as Co, Al, W, Ti, Ta, Ni, Cr are weighed by composition proportion shown in alloy 1~2 in table 1；By above-mentioned scale
The simple substance raw material taken are placed in vacuum arc melting furnace crucible, are evacuated down to 3 × 10 for the first time-3After Pa, it is filled with high-purity Ar
Protective gas is to 7 × 104Then Pa is evacuated down to 3 × 10 for the second time-3Pa is re-filled with high-purity Ar protective gas to 7 × 104Pa；
Alloy melting is carried out in high-purity Ar protective atmosphere, the size of current of melting electric arc is controlled in 250A, after alloy is completely melt
It is kept for 60 seconds, then power-off is cooled to alloy and solidifies completely, repeats the melting step 8 times, finally obtains cobalt base superalloy ingot
Material；In high-purity Ar protective atmosphere, the cobalt base superalloy ingot of above-mentioned preparation is kept the temperature 24 under 1250 DEG C of solid solubility temperature
Hour, it is air-cooled；Then 300 hours are kept the temperature under 750 DEG C of aging temp, quenching is cooling to strengthen cobalt-based high-temperature to get to γ ' phase
Alloy.
Fig. 2 show alloy 1 and keeps the temperature 300 hours under 750 DEG C of aging temp, typical organization's pattern after quenching is cooling
Stereoscan photograph, compared to 50h Aging Microstructure shown in Fig. 1, the γ ' phase morphology variation after 300h timeliness is little, average-size
For 84nm, volume fraction is about 45%, shows that its γ ' hardening constituent can be stabilized at 750 DEG C, and the roughening rate of γ ' phase
It is very low.
Embodiment 3
The pure metals such as Co, Al, W, Ti, Ta, Ni, Cr are weighed by composition proportion shown in alloy 1~2 in table 1；By above-mentioned scale
The simple substance raw material taken are placed in vacuum arc melting furnace crucible, are evacuated down to 3 × 10 for the first time-3After Pa, it is filled with high-purity Ar
Protective gas is to 7 × 104Then Pa is evacuated down to 3 × 10 for the second time-3Pa is re-filled with high-purity Ar protective gas to 7 × 104Pa；
Alloy melting is carried out in high-purity Ar protective atmosphere, the size of current of melting electric arc is controlled in 250A, after alloy is completely melt
It is kept for 60 seconds, then power-off is cooled to alloy and solidifies completely, repeats the melting step 8 times, finally obtains cobalt base superalloy ingot
Material；In high-purity Ar protective atmosphere, the cobalt base superalloy ingot of above-mentioned preparation is kept the temperature 24 under 1250 DEG C of solid solubility temperature
Hour, it is air-cooled；Then 50 hours are kept the temperature under 850 DEG C of aging temp, quenching is cooling to strengthen cobalt-based high-temperature to get to γ ' phase
Alloy.
Embodiment 4
The pure metals such as Co, Al, W, Ti, Ta, Ni, Cr, Nb are weighed by composition proportion shown in alloy 3~4 in table 1；It will be upper
It states the simple substance raw material weighed to be placed in vacuum arc melting furnace crucible, is evacuated down to 3 × 10 for the first time-3After Pa, it is filled with height
Pure Ar protective gas is to 7 × 104Then Pa is evacuated down to 3 × 10 for the second time-3Pa, be re-filled with high-purity Ar protective gas to 7 ×
104Pa；Carry out alloy melting in high-purity Ar protective atmosphere, the size of current control of melting electric arc is complete to alloy in 240A
It is kept for 60 seconds after fusing, then power-off is cooled to alloy and solidifies completely, repeats the melting step 8 times, finally obtains cobalt-based high-temperature
Alloy ingot；In high-purity Ar protective atmosphere, by the cobalt base superalloy ingot of above-mentioned preparation under 1220 DEG C of solid solubility temperature
Heat preservation 24 hours, it is air-cooled；Then 50 hours are kept the temperature under 750 DEG C of aging temp, quenching is cooling to strengthen cobalt to get to γ ' phase
Based high-temperature alloy.
Embodiment 5
The pure metals such as Co, Al, W, Ti, Ta, Ni, Cr, Nb are weighed by composition proportion shown in alloy 3~4 in table 1；It will be upper
It states the simple substance raw material weighed to be placed in vacuum arc melting furnace crucible, is evacuated down to 3 × 10 for the first time-3After Pa, it is filled with height
Pure Ar protective gas is to 7 × 104Then Pa is evacuated down to 3 × 10 for the second time-3Pa, be re-filled with high-purity Ar protective gas to 7 ×
104Pa；Carry out alloy melting in high-purity Ar protective atmosphere, the size of current control of melting electric arc is complete to alloy in 240A
It is kept for 60 seconds after fusing, then power-off is cooled to alloy and solidifies completely, repeats the melting step 8 times, finally obtains cobalt-based high-temperature
Alloy ingot；In high-purity Ar protective atmosphere, by the cobalt base superalloy ingot of above-mentioned preparation under 1220 DEG C of solid solubility temperature
Heat preservation 24 hours, it is air-cooled；Then 50 hours are kept the temperature under 850 DEG C of aging temp, quenching is cooling to strengthen cobalt to get to γ ' phase
Based high-temperature alloy.
Embodiment 6
Embodiment alloy 1~2 is prepared according to the technique in embodiment 3, it is real then to carry out 900 DEG C of 100h oxidations
It tests, Fig. 3 is alloy of the present invention (alloy 1~2) and Waspaloy, Udimet 720Li nickel-base alloy are small in 900 DEG C of oxidations 100
When after oxidation weight gain curve, it can be seen from the figure that alloy of the present invention is substantially better than Ni-based ginseng in 900 DEG C of antioxygenic property
Alloy is examined, 900 DEG C of 100h oxidation weight gains are lower than 0.4mg/cm2, reach complete grade of oxidation resistance.
Embodiment 7
Embodiment alloy 1~2 and embodiment alloy 3~4 are carried out according to the technique in embodiment 3 and embodiment 5 respectively
Preparation then carries out DSC and tests determining γ ' phased soln temperature and solidus temperature.Fig. 4 be alloy of the present invention (alloy 1~4) with
And Waspaloy, the γ ' phase volume fraction at 750 DEG C of Udimet 720Li nickel-base alloy and hot processing window relational graph.From figure
In as it can be seen that embodiment alloy 1~4 is significantly higher than Waspaloy nickel-base alloy in 750 DEG C of γ ' phase volume fraction, and with
Udimet 720Li nickel-base alloy is quite even higher.The hot processing window of embodiment alloy 1~4 and same γ ' phase body simultaneously
Udimet 720Li nickel-base alloy under fraction is compared, and embodiment alloy 1~4 is significantly larger, and hot-working character is more preferable.
Embodiment 8
Embodiment alloy 1~2 and embodiment alloy 3~4 are carried out according to the technique in embodiment 3 and embodiment 5 respectively
Preparation then uses Archimedes's drainage test density.The density of alloy 1 is 8.57g cm-3, the density of alloy 2 is 8.64g
cm-3, the density of alloy 3 is 8.39g cm-3, the density of alloy 4 is 8.76g cm-3, lower than existing most of Co-Al-W base
High temperature alloy, and it is suitable with advanced ni-base wrought superalloy.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiment, Er Qie
In the case where without departing substantially from spirit of that invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, should will implement
Example regards exemplary as, and not restrictive.The scope of the present invention is not limited by above description, but by appended right
It is required that limiting, therefore all changes fallen in the meaning and scope of claim should all be included within the present invention.
In addition, although this specification is described in terms of embodiments, but not each embodiment only includes one only
Vertical technical solution, for the sake of this narrating mode of specification is just for the sake of understanding, those skilled in the art should will illustrate
Book is as a whole.In other words, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (4)
1. a kind of cobalt base superalloy, which is characterized in that its alloy composition is Al:2.5~4%, W:3 by weight percentage
~10%, Ti:0.5~5%, Ta:1.5~6%, Ni:18~35%, Cr:10~14%, Nb:0~4.5%, Hf:0~
0.5%, C:0~0.1%, B:0~0.1%, Zr:0~0.1%, Si:0~0.5%, surplus Co, and Al+Cr >=13.5%, Al
+ Ti+Ta+Nb >=9.5%, W+Ta≤12.5%.
2. cobalt base superalloy as described in claim 1, which is characterized in that the alloy is γ/γ ' two-phase structure, respectively
For the γ matrix phase and L1 of A1 crystal structure2The γ ' precipitated phase of crystal structure, wherein γ ' hardening constituent be cube or spherical morphology
And volume fraction is greater than 40%.
3. a kind of preparation method for preparing the cobalt base superalloy as described in claim 1-2 any one, which is characterized in that specific
Preparation process comprises the steps of:
(1) pure metals such as Co, Al, W, Ti, Ta, Ni, Cr, Nb, Hf, C, B, Zr, Si are weighed by composition proportion；
(2) the above-mentioned simple substance raw material weighed are placed in vacuum arc melting furnace crucible, are evacuated down to 3 × 10 for the first time- 3Pa~5 × 10-3After Pa, high-purity Ar protective gas is filled with to 6 × 104Pa~8 × 104Pa, then it is evacuated down to 3 for the second time ×
10-3Pa~5 × 10-3Pa is re-filled with high-purity Ar protective gas to 6 × 104Pa~8 × 104Pa；
(3) alloy melting is carried out in high-purity Ar protective atmosphere, the size of current of melting electric arc is controlled in 230~260A, wait close
Gold is kept for 30~60 seconds after being completely melt, then power-off is cooled to alloy and solidifies completely, the repetition melting step 6~8 times, finally
Obtain cobalt base superalloy ingot；
(4) the solid solution temperature in high-purity Ar protective atmosphere, by the cobalt base superalloy ingot of above-mentioned preparation at 1200~1250 DEG C
It is degree lower heat preservation 12-24 hours, air-cooled；Then 50-300 hours are kept the temperature in the range of aging temp is 700~900 DEG C, quenching
It is cooling to strengthen cobalt base superalloy to get to γ ' phase.
4. the preparation method of cobalt base superalloy as claimed in claim 3, which is characterized in that cobalt-based high-temperature closes in step (4)
Ingot material keeps the temperature 24 hours under 1200~1250 DEG C of solid solubility temperature, keeps the temperature in the range of aging temp is 700~900 DEG C
50 hours.
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